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Thermo ScientificForma Model 900 Series -86C ULT Upright FreezerOperating and Maintenance Manual 7050902 Rev. 0
Visit us online to register your warrantywww.thermoscientific.com/labwarranty
Thermo Scientific
Preface
Model 900 Series i
Model Capacity(cubic feet) Voltage
902 13 230/50
903 13 120/60
909 13 230/60
904 17 120/60
905 17 230/50
910 17 230/60
906 23 230/50
956 23 120/60
957 23 230/60
907 28 230/50
908 28 230/60
Double Door Units
991 13 230/50
992 13 120/60
986 13 230/60
993 17 120/60
994 17 230/50
988 17 230/60
990 23 120/60
995 23 230/50
989 23 230/60
PartNumber Description Quantity
34040 Key Ring 1 (2 for doubledoor units)
122005 Key 2 (4 for doubledoor units)
380520 Neoprene Cap 2
510016 1/4-20 x 5-1/2” Bolt 2
195763 Retaining Clip 1
370563 Remote AlarmConnector 1
Packing ListModels Covered
MANUAL NUMBER 7050902
0 -- / /11 Release 6 ccs
REV ECR/ECN DATE DESCRIPTION By
Important installer and user information:A redundant temperature sensing device has been included in this ULT freezer.This device is a type “T” thermocouple. For convenient access, the thermocou-ple (Figure 1-3) terminates in an interconnect jack (Figure 1-5) behind the basefront cover. (May be located differently in chests. See Section 1.) It is stronglyrecommended that this thermocouple be attached to a redundant 24 hour 7day monitoring system with alarm capabilities. Connecting the sensor to amonitoring and alarm system separate from the freezer provides the utmost inproduct safety, should the integral system fail. s
Thermo Scientificii Model 900 Series
PrefacePreface
Important Read this instruction manual. Failure to read, understand and follow the instructions in this manualmay result in damage to the unit, injury to operating personnel, and poor equipment performance. s
Caution All internal adjustments and maintenance must be performed by qualified service personnel. s
Material in this manual is for information purposes only. The contents and the product it describes are subjectto change without notice. Thermo Fisher Scientific makes no representations or warranties with respect to thismanual. In no event shall Thermo be held liable for any damages, direct or incidental, arising out of or related tothe use of this manual.
©2011 Thermo Fisher Scientific. All rights reserved.
Contains Parts and Assemblies
Susceptible to Damage by
Electrostatic Discharge (ESD)
CAUTION
Thermo Scientific Model 900 Series iii
Preface
Important operating and/or maintenance instructions. Read the accompanying text carefully.
Potential electrical hazards. Only qualified persons should perform procedures associated with thissymbol.
Extreme temperature hazards, hot or cold. Use special handling equipment or wear special, protectiveclothing.
Hot surface(s) present which may cause burns to unprotected skin, or to materials which may bedamaged by elevated temperatures.
Marking of electrical and electronic equipment, which applies to electrical and electronic equipmentfalling under the Directive 2002/96/EC (WEEE) and the equipment that has been put on the marketafter 13 August 2005.
This product is required to comply with the European Union’s Waste Electrical & ElectronicEquipment (WEEE) Directive 2002/96/EC. It is marked with the WEEE symbol. Thermo FisherScientific has contracted with one or more recycling/disposal companies in each EU Member StateEuropean Country, and this product should be disposed of or recycled through them. Furtherinformation on Thermo’s compliance with this directive, the recyclers in your country andinformation on Thermo products will be available at www.thermofisher.com.
4 Always use the proper protective equipment (clothing, gloves, goggles, etc.)
4 Always dissipate extreme cold or heat and wear protective clothing.
4 Always follow good hygiene practices.
4 Each individual is responsible for his or her own safety.
Thermo Scientificiv Model 900 Series
Preface
Do You Need Information or Assistance on
Thermo Scientific Products?
If you do, please contact us 8:00 a.m. to 6:00 p.m. (Eastern Time) at:
1-740-373-4763 Direct
1-800-438-4851 Toll Free, U.S. and Canada
1-877-213-8051 FAX
http://www.thermoscientific.com Internet Worldwide Web Home Page
Service E-Mail Address
Thermo Fisher Scientific
401 Millcreek Road, Box 649
Marietta, OH 45750
Our staff can provide information on pricing and give you quotations. We can
take your order and provide delivery information on major equipment items or make
arrangements to have your local sales representative contact you. Our products are listed on the
Internet and we can be contacted through our Internet home page.
Our staff can supply technical information about proper setup, operation or
troubleshooting of your equipment. We can fill your needs for spare or replacement parts or
provide you with on-site service. We can also provide you with a quotation on our Extended
Warranty for your Thermo Scientific products.
Whatever Thermo Scientific products you need or use, we will be happy to discuss your
applications. If you are experiencing technical problems, working together, we will help you
locate the problem and, chances are, correct it yourself...over the telephone without a service
call.
When more extensive service is necessary, we will assist you with direct factory trained
technicians or a qualified service organization for on-the-spot repair. If your service need is
covered by the warranty, we will arrange for the unit to be repaired at our expense and to your
satisfaction.
Regardless of your needs, our professional telephone technicians are available to assist you
Monday through Friday from 8:00 a.m. to 6:00 p.m. Eastern Time. Please contact us by
telephone or fax. If you wish to write, our mailing address is:
International customers, please contact your local Thermo Scientific distributor.
Sales Support
Service Support
Model 900 Series vThermo Scientific
Table of Contents
Installation and Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1Control Panel Keys, Displays, Indicators . . . . . . . . . . . . . . . . . . . . . .1-4Operation of the Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5Install Freezer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
Choose Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5Install Wall Bumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6Remote Alarm Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6Install Shelves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6Connect Unit to Electrical Power . . . . . . . . . . . . . . . . . . . . . . . . . .1-7Attach Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7Freezer Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8Set Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8Set Low Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9Set High Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
Run Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10
Calibrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1Calibrate Control Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Temperature Stabilization Periods . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1Probe Failure Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2High Stage System Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1Clean Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1Clean Cabinet Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1Clean Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Clean Water-cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2Defrost Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3Vacuum Relief Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3Clean Door Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3Prepare Unit for Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5Replace Battery(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . .4-6
Section 1
Section 2
Section 3
Section 4
vi Model 900 Series Thermo Scientific
Section 5 Factory Installed Options . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1BUS - Back Up System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Install Vent Stack, Solenoid and Injection Assembly . . . . . . . . . . . .5-1Install Temperature Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3Connect Probe/Solenoid Harness . . . . . . . . . . . . . . . . . . . . . . . . . .5-4BUS Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5Set Optional BUS Set Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6Configure Optional BUS (Back-Up System) . . . . . . . . . . . . . . . . . .5-6Test BUS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
Clean Vent Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7Disconnect Fitting Asm. and Transfer Hose . . . . . . . . . . . . . . . . . . .5-7Chart Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
Recorder Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8Change Recorder Temperature Range . . . . . . . . . . . . . . . . . . . . . . .5-8Installing the Chart Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8
Five Inner Door Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9Water-cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1Single Door Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1Double Door Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 - 1
Refrigeration Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 1
Electrical Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 - 1
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 1
Handling Liquid Nitrogen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A - 1Handling Liquid CO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B - 1First Aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C - 1
Table of Contents
Section 5
Section 6
Section 8
Section 7
Section 9
Section 10
Appendix
Model 900 Series 1-1Thermo Scientific
Section 1 Installation and Start-up
• Control panel - keypad, displays and indicators
• BUS (Optional Back Up System) control panel
• Optional temperature recorder or datalogger
Optional Back UpSystem Controls
Temperature
Recorder
(Optional)
Control Panel
Figure 1-1. Freezer Front View Components
1-2 Model 900 Series Thermo Scientific
Section 1Installation and Start-Up
Thermo Scientific
Optional Back-up
System Connections
Power Switch
(mains
disconnect)Power Inlet
Remote Alarm
Contacts
Wall Bumper(pre-tapped holes)
Figure 1-2. Freezer Rear View Components
Shelf
Bracket
Sealant
(Caution: This is a critical seal.
Seal must be maintained.)
Optional - Recorder Probe/Datalogger Probe
Control RTD/Redundant Type T
Thermocouple Probe
Optional Miscellaneous Accessories Probe
Figure 1-3. Chamber Probe(s)
• Remote alarm contacts
• Power inlet for power cord connection
• Optional BUS connections for probe and solenoid
• Power switch (mains disconnect)
Model 900 Series 1-3Thermo Scientific
Section 1Installation and Start-Up
• Vacuum relief port - pressure equalization port
• Probe cover - houses control, optional recorder, datalogger, or 1535alarm probes
• Battery mounting bracket(s)
• Battery power switch (freezer and BUS)
• Freezer battery
• Optional BUS battery
• Freezer filter location
Figure 1-4. Vacuum Relief and Probe Cover Location
O
Battery power
switchTo
remove filterThermocouple
interconnect jack
Battery mounting
bracket
Freezer batteryand optional BUS battery
Figure 1-5. Battery(s) location and switch
• Temperature Display - Displays temperature in degrees Celsius.
• Mode Select Switch - Used to select Run, Set Temperature, Set HighAlarm, Set Low Alarm, Calibrate, Backup.
• Alarm Indicator - Light pulses on/off during an alarm condition of thecabinet.
• Silence - Silences the audible alarm. See Section 4 for alarm ringbacktimes.
• Alarm Panel - indicates the current alarm condition.
• Up and Down Arrows - Increases or decreases values, toggles betweenchoices.
• Enter - Stores the value into memory
1-4 Model 900 Series Thermo Scientific
Section 1Installation and Start-Up
TemperatureDisplay
ModeKey
AlarmIndicator
SilenceKey
AlarmPanel
Up and DownArrows
Enter Key
Figure 1-6. Control Panel
Control Panel Keys,Displays, Indicators
Model 900 Series freezer has five basic modes which allow freezer setupand operation. Press the Mode key to scroll through the mode selections.
Up Arrow: Increases or toggles the parameter value.
Enter: Must press Enter key to save to memory all changedvalues.
Down Arrow: Decreases or toggles the parameter value.
Silence Key: Press to silence the audible alarm. See Section4 for alarm ringback times.
Note If tipped more than 45°, allow the unit to sit upright for 24 hoursbefore start up. s
To remove the freezer from the pallet, use a 7/16" wrench to remove allthe bolts securing the shipping bracket to the pallet.
Remove the shipping bracket. Remove the ramp boards from the palletand place the slotted end over the ramp brackets on the pallet. Thesupport blocks on the ramps will be facing down. Before moving thefreezer, make sure the casters are unlocked and moving freely. Align thecaster with the ramp boards. Use adequate personnel to roll the freezer offthe pallet.
The freezer can be easily pushed to the desired approved location,described below. If necessary, the doors and lower front panel may beopened to move the unit through tight openings. When the freezer is inposition, set the front caster brakes.
Note The freezer must not be moved with the product load inside. s
Note For proper ventilation and airflow, a minimum clearance of 5” at therear and top and a clearance of 8” on the side of the freezer is required.Allow adequate space in the front of the freezer for door opening. s
Locate the freezer on a firm, level surface in an area with an ambienttemperature between 18°C and 32°C. Provide ample room to reach themains disconnect switch (power switch) located on the rear of the freezer.
Model 900 Series 1-5Thermo Scientific
Section 1Installation and Start-Up
Install Freezer
Choose Location
Operation of theKeypad
The parts bag, located inside the cabinet, contains the following parts.
Install the bolts into the pre-tapped holes on the back of the compressorsection. Install a neoprene cap on each bolt. Refer to Figure 1-2 for thelocations of the pre-tapped holes.
Install the shelf clips into the shelf pilasters (front and back) at the desiredshelf level. Install the shelves in the cabinet onto the clips.
Note Maximum shelf load is 100 lbs (45.4 kg) per shelf. s
Note On units having the optional 5 inner door option, refer to theinstructions accompanying the inner door kit. s
See Figure 1-2 for the location of the remote alarm contacts. The remotealarm connector is located in the parts bag provided with the manual. Itmust be installed if connecting the freezer to an alarm system. Afterinstalling the wiring from the alarm system to the connector, install theconnector to the freezer microboard and secure with the two screwsprovided. The remote alarm provides a NO (normally open) output, a NCnormally closed) output and COM (common). The contacts will trip on apower outage and high temperature or low temperature alarms. They willalso trip on high stage, control probe or microboard failures.
Figure 1-8 shows the remote contacts in alarm state.
1-6 Model 900 Series Thermo Scientific
Section 1Installation and Start-Up
Install Shelves
Remote Alarm Contacts
Figure 1-8. Remote Alarm Contacts
IMPORTANT USER INFORMATIONIMPORTANT USER INFORMATION
�������� ���� ����� ������ �� ��������� � �������� �� ������� ��������������� ���� ���� �� �������� �� ��������������� ��� �������� �� �� ����������� ���������� ��������� ������ ��!���������� �����
Quantity Stock # Description Purpose
2 510016 1/4-20 x 5-1/2” Bolt Wall Bumper
2 380520 Neoprene Cap Cap Protector
Table 1-1. Parts bag
Install Wall Bumpers
Insert the power cord into the power inlet module. Place the retainingbracket (P/N 195763) over the connector. Tighten retaining screws tosecure.
See the serial tag on the side of the unit for electrical specifications or referto the electrical schematics in this manual. s
The freezer should be operated on a dedicated grounded service. Checkthe voltage rating on the serial tag of the unit and compare it with theoutlet voltage. Then, with the power switch turned off, plug the line cordinto the wall outlet.
First, turn on the freezer power switch. Then open the lower front door bygrasping the bottom left corner. Locate the battery switch (Figure 1-5) andturn it to Standby mode ( ). During initial freezer start-up, the systembattery may require charging and the Low Battery indicator mayilluminate.
Note Ensure the battery switch is turned to Standby mode ( ). Therechargeable batteries require 36 hours to charge at initial start-up. A “LowBattery” alarm may occur until the batteries are fully charged. Should apower failure occur during the initial start-up period, the electronics willhave limited operation. s
Model 900 Series 1-7Thermo Scientific
Section 1Installation and Start-Up
Attach Power Cord
Connect Unit to ElectricalPower
Figure 1-9. Power Cord Connection
With the freezer properly installed and connected to power, system setpoints can be entered. The following set points can be entered in Settingsmode: Control temperature, high temperature alarm set point, lowtemperature alarm set point, and (optional) BUS set point. Default settingsare shown in the table below.
Note If the set point is changed and the low temperature and hightemperature alarms are set 10° from the set point, the alarm set points willbe adjusted automatically to maintain a distance of at least 10° from setpoint. s
Model 900 Series freezers have an operating temperature range of -50°C to-86°C, depending on ambient temperature. The freezer is shipped from thefactory with a temperature set point of -80°C. To change the operatingtemperature set point:
1. Press the Mode key until the Set Temperature indicator lights.
2. Press the up/down arrow key until the desired temperature set point isdisplayed.
3. Press Enter to save the set point.
4. Press the Mode key until the Run indicator lights for Run mode
If no keys are pressed, the freezer will automatically return to RUN modeafter 5 minutes.
Note If the set point is changed and the low temperature and hightemperature alarms are set 10° from the set point, the alarm set points willbe adjusted automatically to maintain a distance of at least 10° from setpoint. s
1-8 Model 900 Series Thermo Scientific
Section 1Installation and Start-Up
Freezer Start-Up
Default Settings Temperature
Control Set Point -80°C
High Temperature Alarm -70°C
Low temperature alarm -90°C
Optional BUS Set Point -60°C
Table 1-2. Default Settings
Set OperatingTemperature
The high temperature alarm will activate an audible/visual warning whenthe freezer chamber temperature has reached or exceeded the hightemperature alarm set point.
To set the high temperature alarm set point:
1. Press the Mode key until the Set High Alarm indicator lights.
2. Press the up or down arrow key until the desired high temperaturealarm set point is displayed.
3. Press Enter to save the setting.
4. Press the Mode key until the Run indicator lights for Run mode
If no control keys are pressed, the freezer will automatically return to RUNmode after 5 minutes.
Note The high alarm set point must be set at least 5°C from the controlset point. s
Note At initial start-up, the high temperature alarm is disabled until thecabinet reaches set point or 12 hours elapse. s
The low temperature alarm will activate an audible/visual warning whenthe freezer chamber temperature has reached or decrease below the lowtemperature alarm set point.
To set the low temperature alarm set point:
1. Press the Mode key until the Set Low Alarm indicator lights.
2. Press the up or down arrow key until the desired low temperaturealarm set point is displayed.
3. Press Enter to save the setting.
4. Press the Mode key until the Run indicator lights for Run mode
If no control keys are pressed, the freezer will automatically return to RUNmode after 5 minutes.
Note The low alarm set point must be set at least 5°C from the control setpoint. s
Model 900 Series 1-9Thermo Scientific
Section 1Installation and Start-Up
Set High TemperatureAlarm
Set Low TemperatureAlarm
Run mode is the default mode for the freezer. This mode displays thecabinet temperature on the temperature display under normal operatingconditions. In addition, the Run mode allows display of the high stage heatexchange temperature.
This information scrolls by pressing the up or down arrow keys. Thedisplay returns to the operating temperature in 10 seconds if no keys arepressed.
1-10 Model 900 Series Thermo Scientific
Section 1Installation and Start-Up
Run Mode
Model 900 Series 2-1Thermo Scientific
Section 2 Calibrate
Once the freezer has stabilized, the control probe may need to becalibrated. Calibration frequency is dependent on use, ambient conditionsand accuracy required. A good laboratory practice would require at least anannual calibration check. On new installations, all parameters should bechecked after the stabilization period.
Caution Before making any calibration or adjustments to the unit, it isimperative that all reference instruments be properly calibrated. s
Plug a type T thermocouple reader into the receptacle located inside thelower door (see Figure 1-5). Compare the control temperature set point tothe temperature of the measuring device.
1. Press the Mode key until the Calibrate indicator lights.
2. Press up/down arrow to match the display to calibrated instrument.
3. Press Enter to store calibration.
4. Press the Mode key to return to Run mode.
Startup - Allow 12 hours for the temperature in the cabinet to stabilizebefore proceeding.
Already Operating - Allow at least 2 hours after the display reaches setpoint for temperature to stabilize before proceeding.
During calibration, the temperature display will not be available. s
If no keys are pressed for approximately five minutes while in calibrationmode, the system will reset to Run mode.
Calibrate ControlProbe
Temperature StabilizationPeriods
Model 900 Series 3-1Thermo Scientific
Section 3 Alarms
The Model 900 Series freezer alarms are displayed on the freezer controlpanel. When an alarm is active, the indicator next to the alarm descriptionwill light and there will be an audible alarm. Press the Silence key todisable the audible alarm for the ringback period. The visual alarm willcontinue until the freezer returns to a normal condition. The alarms aremomentary alarms only. When an alarm condition occurs and then returnsto normal, the freezer automatically clears the alarm condition.
All alarm delays and ringback times are ±30 seconds. * The automatic battery test runs immediately on power-up, then every 8 hours thereafter.
Description Delay Ringback Relay
Power Failure 1 min. 15 min. Yes
High Temperature Alarm 1 min. 15 min. Yes
Low Temperature Alarm 1 min. 15 min. Yes
Probe Failure see 3.2 1 min. 15 min. No
Door Open 1 min. 15 min. No
Wrong Power 0 min. none Yes
Low Battery* 1 min. 8 hours No
Low BUS Battery (optional) 1 min. 15 min. No
Hot Condenser 1 min. none No
High Stage Failure 0 min. 15 min. Yes
Micro Board Failure 0 min. 15 min. Yes
Table 3-1. Alarm Indicators
3-2 Model 900 Series Thermo Scientific
Section 3Alarms
The "high stage system failure" condition is created when the high stagecompressor and fans run for 30 minutes and are not capable of cooling theinterstage heat exchanger to the proper temperature. Under this condition,the high stage compressor and fans will turn off after 30 minutes and anaudible and visual alarm will occur. The audible alarm can be silenced andwill ring back every 15 minutes.
The microprocessor in Model 900 Series freezers continually scans allprobes including the control probe, heat exchanger probe and condenserprobe to ensure that they are operating properly. Should an error bedetected, the "Probe Failure" alarm will occur as described above. If anerror is detected with the control probe, the high and low stagecompressors will run continuously. As a result, the cabinet temperaturewill decrease until it reaches the lowest temperature that the refrigerationsystem can maintain. If an error is detected with the heat exchanger probe,the freezer will cycle properly at its temperature set point using a 5 minutestep start between the high and low stage compressors. If an error isdetected with the condenser probe, there is no impact on the performanceof the freezer; however, the hot condenser alarm may also occur. Contactthe Technical Services department or your local distributor.
High Stage SystemFailure
Probe Failure Alarm
Model 900 Series 3-3Thermo Scientific
Section 3Alarms
Error Notes
Er00Name: Improper model selected.Description: Indicates that DIP SW3 has not selected a proper model or can’t be accessed properly.Response: Display shows “Er00” and will not start-up until a proper model is selected. Contact Technical Services.
ErA1 This error condition will prevent peripherals (fans, compressors, etc.) from powering up with the incorrect voltage.Name: Voltage/Frequency failureDescription: Indicates the measured RMS line voltage did not agree with the logic level sensed by the micros provided by theinstalled high voltage PCB; or the measured RMS voltage is not within a tolerable range (180 < Vac < 270 for 230VAC unit / 85 <Vac < 160 for 115VAC unit); or the frequency measured over 10 cycles was not within a tolerable range (55 Hz < Freq < 70 Hz for60 Hz units / 40 Hz < Freq < 55 Hz for 50 Hz units)Response: This condition is checked at power on reset and if it is active, the unit will NOT power up. The unit will indefinitelydisplay “Er_1” in the display and continue to monitor the frequency and voltage. Furthermore, the audible alarm will sound. Otherstartup error messages may be displayed prior to this message; however, the system will stop the startup sequence for this condi-tion.ErA1 .. No pulses (zero crossings) detected to determine frequency (50 / 60 Hz)ErC1 .. Frequency detected is below 50 HzErd1 .. Frequency detected is above 60 Hz (possible noise spikes on supply voltage)ErE1 .. Unit is 230V and the voltage detected is below the low limit (180VRMS)ErF1 .. Unit is 230V and the voltage detected is above the high limit (260VRMS)Erg1 .. Unit is 115V and the voltage detected is below the low limit (85VRMS)ErH1 .. Unit is 115V and the voltage detected is above the high limit (160VRMS)
ErC1
Erd1
ErE1
ErF1
Erg1
ErH1
Er02
Name: Control (Cabinet) Sensor FailureDescription: This condition indicates that the control sensor has failed to produce a valid reading for >12 consecutive reads (~60seconds).Response: The unit will stage both compressors on (if necessary) and the unit will attempt to head to bottom out. If the sensorrecovers, the system will begin to operate normally and respond to the temperature feedback. The remote alarm contacts willbecome active. ‘Er02’ will be added to the main display queue and the last valid cabinet temperature value will not be displayed.
Er03
Name: Heat Exchange Sensor FailureDescription: This condition indicates that the heat exchange sensor has failed to produce a valid reading for >12 consecutivereads (~60 seconds).Response: The display will show “Er03” only when the button sequence to read the heat exchange sensor is depressed.
3-4 Model 900 Series Thermo Scientific
Section 3Alarms
Error (cont.) Notes
Er05
Name: Display Firmware Integrity FailureDescription: The display firmware has failed to pass its CRC CCITT checksum integrity test.Response: The display performs this check at startup and the display board will fail to startup without any error indication if itdoes not pass this at power on.
Er06
Name: Micro Firmware Integrity FailureDescription: The micro firmware has failed to pass its CRC CCITT checksum integrity test.Response: This is checked at power on reset and the “Er06” will be displayed for ~10 seconds at startup if this conditionexists.
Er07
Name: Micro Fail - CS5521 SPI Failure / UISR FailureDescription: This condition indicates a micro board failure due to either the SPI bus is unable to communicate with the ADCdevice or a UISR event caused the microcontroller to be in an unstable state.Response: The unit will try to recover from this fault three times by a hardware reset of the micro board. In the event that thesystem couldn’t rectify the issue, the following sequence of events will occur:
1. Remote alarm contacts will become active.2. Buzzer will annunciate audibly and will have a ringback of 15 minutes.3. “Seven segment” display will show “Er07”.4. The system will have 10 minute staging between the high stage compressor and the low stage compressor activation.5. The system will go to bottom out temperatures.
Er09Name: Stuck ButtonDescription: This condition indicates that the display board has a stuck button.Response: The Er09 will show on the display periodically.
Er11
Name: Condenser Probe Sensor FailureDescription: This condition indicates that the condenser probe sensor has failed to produce a valid reading for >12 consecutivereads (~60 seconds).Response: The display shows “Er11”.
dErr This is a general display error in which value being displayed can not be represented within characters provided.
(Four dashes)---- in display
Name: Lost CommunicationDescription: Communication between the micro board and the display board has been lost. Under this condition, the visualalarm flashes along with dashes in the temperature display (----). Contact Technical Services.
Model 900 Series 4-1Thermo Scientific
Section 4 Maintenance
Wipe down the freezer exterior using soap and water and a general uselaboratory disinfectant. Rinse thoroughly with clean water and dry with asoft cloth.
Caution Avoid the excessive use of water around the control area due tothe risk of electrical shock. Damage to the controls may also result. s
The air filter should be cleaned four times a year, minimum.
1. Open the front lower door by grasping the bottom left corner.
2. Locate the grille on the door.See Figure 4-1. Grasp themiddle of the grille materialand gently pull out to remove.
3. Wash the filter material usingwater and a mild detergent.
4. Dry by pressing between twotowels.
5. Install the filter back into the grille and attach the grille.
The condenser should be cleaned once per year, minimum.
1. Open the front lower door by grasping the bottom left corner.
2. Using a vacuum cleaner, exercising care to not damage the condenserfins, clean the condenser.
Depending upon environmental conditions, the condenser may need to becleaned more frequently.
Clean Cabinet Exterior
Clean Air Filter
Clean Condenser
Figure 4-1. Grille with Filter Location
4-2 Model 900 Series Thermo Scientific
Section 4Maintenance
The water-cooled condenser can be cleaned-in-place by using the CIPprocedure. Cleaning solutions can be used, depending on type of depositsor build-up to be removed.
Note Do not use liquids that are corrosive to stainless steel or the brazingmaterial (copper or nickel). s
1. Disconnect the unit from the water supply.
2. Drain the unit.
3. Rinse with fresh water and drain the unit again.
4. Fill with fresh water.
5. Add cleaning agent (solution and concentration dependent on depositsor build-up).
6. Circulate cleaning solution (if feasible).
7. Drain the cleaning solution.
8. Add and circulate a passivating liquid for corrosion inhibition of platesurfaces.
9. Drain this liquid.
10. Rinse with fresh water and drain.
11. Reconnect the water supply and fill the unit.
12. Return to service.
Clean Water-cooledCondenser
CIP (Clean-In-Place)Procedure
Model 900 Series 4-3Thermo Scientific
Section 4Maintenance
1. Remove all product and place it in another freezer.
2. Turn the unit off and disconnect it from the power source.
3. Turn off the battery switch (O). See Figure 4-6.
4. Open all of the doors and place towels on the chamber floor.
5. Allow the frost to melt and become loose.
6. Remove the frost with a soft cloth.
7. After defrosting is complete, clean the interior with a non-chloridedetergent. Rinse thoroughly with clean water and dry with a soft cloth.
8. Plug unit in and turn power switch on.
9. Turn the battery power switch to Standby mode ( ).
10. Allow the freezer to operate empty overnight before reloading theproduct.
The door gasket should be cleaned monthly, minimum. Using a soft cloth,remove any frost build-up from the gasket and door(s). The door gasketmay need to be cleaned more frequently if dirt or excessive frost build-upprevents the door from closing properly.
The exterior door gasket provides an excellent seal to protect product,provide an energy efficient thermal barrier to keep cold air in and roomtemperature air out, and reduce frost build up on the inner doors.
Because the door gasket seals so well, a vacuum can be created after a dooropening. Warm air enters the cabinet, cools and contracts, creating avacuum that pulls the door in tightly against the seal.
To equalize the pressure inside the cabinet after a door opening requires1.5-3.0 cu.ft. of ambient air to be drawn into the cabinet. The amount ofair required to equalize the pressure varies depending on the cabinet size,cabinet temperature, duration of door opening, inventory volume and thetemperature/humidity of the ambient air. The unit is designed with a“vacuum relief port” that allows the pressure to be equalized.
Clean Door Gasket
Vacuum Relief Port
Defrost Chamber
4-4 Model 900 Series Thermo Scientific
Section 4Maintenance
The time required to draw 1.5-3.0 cu.ft. of air into the cabinet depends ontwo factors:
a) the size and number of paths available for the air to enter the cabinet,and
b) the pressure difference between the internal cabinet and the ambientroom.
Cabinets with the vacuum relief port operating normally, (i.e. vacuum reliefport is not iced over) will require a minimum of 30 seconds up to amaximim of 120 seconds for the cabinet to equalize. This is also a goodindication that the exterior door is well sealed.
The vacuum relief port requires routine maintenance. It will ice over unlesspreventive measures are taken. If the vacuum relief port becomes iced over,the freezer will take several hours to equalize pressure.
Warning Do not leave the freezer unattended while the door is unlatched.The vacuum could release, resulting in a door opening and product loss. s
Observe the inner side of port periodically for frost and ice build-up.Remove any frost with a soft dry cloth. If the tube should become cloggedwith ice, it must be cleaned. Make sure during cleaning that the vacuumrelief tube is completely free of ice to prevent rapid ice formation.
Factors that can affect the performance of the vacuum relief port include:high ambient temperature, high humidity conditions and frequent dooropenings. Maintenance should be performed weekly or as needed.
Warning Failure to maintain the vacuum relief port may result in excessiveice build up inside the tube, clogging the port, and inability to open thedoor. The vacuum relief port may need to be cleaned more often withfrequent door openings and high humidity environments. s
Section 4Maintenance
Vacuum Relief Port(continued)
Model 900 Series 4-5Thermo Scientific
Section 4Maintenance
1. To gain access to the battery, open the lower door by grasping thebottom left corner. The battery is rectangular in shape, located on thefront left corner of the compressor compartment and is secured inplace by a mounting bracket.
2. Directly above the battery(s) is the battery power switch. Turn thebattery power switch to the off position (O).
3. Disconnect the battery connections.
4. Remove the old battery and install the new battery.
6. Reconnect the battery (red to positive and black to negative).
7. Turn the battery power switch to Standby mode ( ).
8. Close lower panel door.
Warning The % of charge can vary depending on the age, usage andcondition of the battery. For a consistent and dependable charge, replacethe battery every 2 years. Replacement batteries must be rechargeable andare available from Thermo. Refer to the parts list for stock number anddescription of the replacement batteries. Dispose of the used batteries in asafe manner and in accordance with good environmental practices. s
Defrost the unit as described in ‘Defrost Freezer’. This will prepare theunit for storage. Turn off the battery power switch (O). Turn off thefreezer power switch. Disconnect power to the battery(s) and to thefreezer.
Note If the unit has been in service, turn it off and disconnect the powercord connector before proceeding with any maintenance. s
O
Battery power
switch
reThermocouple
interconnect jack
Battery mounting
bracket
Freezer batteryand optional BUS battery
Figure 4-6. Battery Power Switch
Replace Battery(s)
Prepare Unit forStorage
4-6 Model 900 Series Thermo Scientific
Section 4Maintenance
* Qualified service technicians only** Dispose of properly, according to all state and federal regulations.
Action Monthly YearlyEvery2 Years
Verify ambient temperature, <90°F 4
* Adjust door handle for firm latching, as needed 4
Check and clean probe cover, gaskets, hinges and lid(s) of ice and snow. SeeFigure 1-4 for probe location. See “Cleaning the Lid Gasket”.
4
More frequent cleaning may berequired, depending on use andenvironmental conditions.
Check air filter. Clean or replace as needed. See “Cleaning the Air Filter”. 4
Check alarm back-up battery. See “Connecting the unit to Electrical Power” inSection 1 and “Replacing the Battery” in Section 4.
4 **Replace
Check condenser fan motor for unusual motor noise or vibration. 4
* Verify and document calibration, at the minimum, annually. See Section 2Calibration.* Clean condenser compartment and wipe off condenser See “Cleaning thecondenser” in Section 4.
4
To minimize ice build-up inside of freezer:
• Locate the freezer away from drafts or heating/cooling vents
• Keep the number of door openings to a minimum
• Minimize the length of time door is open
• Make sure door latches securely after opening
PREVENTIVE MAINTENANCEFreezers
Your equipment has been thoroughly tested and calibrated before shipment. Regular preventive maintenance is important to keep yourunit functioning properly. The operator should perform routine cleaning and maintenance on a regular basis. For maximumperformance and efficiency, it is recommended that the unit be checked and calibrated periodically by a qualified service technician.
The following is a condensed list of preventive maintenance requirements. See the specified section of the instruction manual forfurther details.
We have qualified service technicians, using NIST traceable instruments, available in many areas. For more information on PreventiveMaintenance or Extended Warranties, please contact the Technical Services Department. Cleaning and calibration adjustment intervalsare dependent upon use, environmental conditions and accuracy required.
Tips:• Fill an upright by starting at the bottom near the probe and add racks to one shelf at a time. Allow freezer to recover to set point
between shelves.• Fill a chest by starting at the left side near the probe. Filling with room temperature racks will result in a long pull-down time.• Fill unit with frozen product to help overall performance; frozen water jugs, for example.• Always make certain the vacuum relief port is free of frost and ice, to allow for timely re-entry into the freezer after a door
opening.
Model 900 Series 5-1Thermo Scientific
Section 5 Factory Installed Options
Note Before installation of BUS components, make sure the power to thefreezer is disconnected, the battery switch is turned off (O) and the freezerhas warmed to ambient temperature. s
The built-in BUS (back up system) maintains the freezer chambertemperature below the critical level in the event of a power or equipmentfailure. If power to the freezer fails, or temperature increases to the back upalarm set point, the BUS injects liquefied gas into the chamber to keep thechamber temperature within the specified range.
The BUS operates on an internal 12-volt, rechargeable battery which iskept charged during normal operation by the integral battery charger.
1. Install the injection assembly through the 1/2” pre-punched hole,directly behind the 2” vent stack hole in the center of the chamberceiling.
Note Cover the open end of injection assembly with tape to keepinsulation from entering the nipple. s
2. Slide 3/8” flatwasher over open end of nipple.
3. Insert the covered end of the injection assembly through the exteriorhole.
4. Remove the tape covering from the end of the nipple and install the1/8” NPT brass tee on the open end of the nipple. Place Permagumsealant between the brass tee and the interior top.
5. Remove the two Phillips head screws securing the metal bracket on thevent stack assembly.
6. Install the vent stack through the opening and secure it to the top ofthe freezer, using screws.
Back Up System (BUS)- P/N 1950445, 1950447
Install Vent Stack, Solenoidand Injection Assembly
5-2 Model 900 Series Thermo Scientific
Section 5Factory Installed Options
Figure 5-1. Injection Assembly
Figure 5-2. Vent Stack Assembly
Install Vent Stack, Solenoidand Injection (continued)
Model 900 Series 5-3Thermo Scientific
Section 5Factory Installed Options
7. Inside the chamber, seal around the end of the vent stack withPermagum.
8. Install the transfer hose connecting one end to the injection assembly,the other to the solenoid valve. Connect the solenoid valve to thesupply source. The solenoid mounting bracket may be discarded.
Note When selecting a CO2 supply cylinder, it must be equipped with asiphon tube. s
1. Locate the 0.500” pre-punched hole inthe upper left hand back corner of thechamber ceiling. Remove the tie wrapsecuring the coiled probe/solenoidharness. Uncoil the probe lead and runthe probe tip (approximately 12”) downthrough 0.500” porthole (Figure 5-4).
2. As shown in Figure 5-3, thread the smalltie wrap through the openings in thefront of the bracket. Secure the probe onthe back of the bracket with the tie wrap.
3. Tap #8-32 the twopre-punched holeslocated on the interiorleft wall of the freezer.Mount the bracket.Figure 5-4 shows theBack-Up probemounted on theinterior left side wallof the freezer.
Install Vent Stack, Solenoidand Injection (continued)
Install Temperature Probe
290167
Back-Up Probe
30037
Small Tie
Wrap
195419
Probe Mounting
Bracket
Figure 5-3. Secure probe
Figure 5-4. Mounted probe clip
Spade lug
connections
to solenoid
Tie wrap
anchor
Probe wire
BUS connection
Power switch
(mains disconnect)Remote Alarm
Contacts Power Outlet
Figure 5-5. Probe wire and solenoid connections
5-4 Model 900 Series Thermo Scientific
Section 5Factory Installed Options
Connect Probe/SolenoidHarness
1. Remove the four screws on the freezer back panel and use them tomount the tie wrap anchors as shown in Figure 5-5. Secure the probewire with tie wraps.
2. Plug the solenoid/probe connector into the BUS connection and securewith a screw on the right and left side. The connector is keyed.
3. Loosen the terminal screws on the solenoid. Slide the spade lugconnectors under the screws and tighten to secure.
4. Connect power to the freezer. Turn the freezer On, with battery switchOff (O).
a. The Solenoid Engaged light on the BUS control panel willilluminate (no injection occurs). This light stays on until the unit isbelow BUS setpoint.
b. The Low Battery indicator may also illuminate.
5. Turn the battery switch to Standby mode ( ) to charge both batteries.
The following section describes the configuration and operation of theBUS.
Warning When activated, this unit injects liquid nitrogen or carbondioxide. Liquid nitrogen can cause serious freezing (frostbite) if it comes incontact with unprotected skin or eyes. Nitrogen suppresses oxygen levelsand may cause suffocation if area is not well ventilated. Refer to AppendixA for the proper handling of liquid LN2. s
Caution Make sure the pressure relief valve on any LN2 tank is adjusted to30 PSI maximum blow-off. s
Warning Carbon dioxide gas suppresses oxygen levels and may causesuffocation if area is not well ventilated. Refer to “Handling Liquid CO2
in Appendix B of this manual. s
Power - indicates the unit has AC power.
Low Battery - battery charge is low. The battery needs replaced orrecharged.
Solenoid Engaged - BUS has opened the solenoid so it can inject gas(CO2 or LN2).
Press-To-Test - activates the solenoid and injects LN2 or CO2 into thefreezer chamber as long as the button is depressed. The solenoid engagedindicator should light. If the Low Battery indicator lights during the test,replace the BUS battery.
Note Solenoid will not engage if door is open. s
Model 900 Series 5-5Thermo Scientific
Section 5Factory Installed Options
BUS Control Panel
Figure 5-6. BUS Control Panel
5-6 Model 900 Series Thermo Scientific
Section 5Factory Installed Options
The optional BUS can be configured for LN2 or CO2 supply. To selectthe supply type:
1. Press the Mode key until the Backup indicator lights.
2. Press the up or down arrow key. The display will show “cO2” or“Ln2” for selection.
3. Press Enter to save the setting.
4. Press the Mode key until the Run indicator lights for Run mode
If no control keys are pressed, the freezer will automatically return to toRUN mode after 5 minutes.
The optional back up system is designed to inject CO2 or LN2 into thefreezer compartment if the temperature rises above back up system setpoint. To set the BUS set point:
1. Press the Mode key until the Set Temperature and Backup indicatorslight.
2. Press the up or down arrow key until the desired BUS set point isdisplayed.
3. Press Enter to save the setting.
4. Press the Mode key until the Run indicator lights for Run mode
If no control keys are pressed, the freezer will automatically return to toRUN mode after 5 minutes.
Warning Changing the operating temperature set point can affect the BUSset point. The BUS set point will self-adjust to maintain a temperature ofat least 10°C above the operating temperature set point. s
Note The BUS set point can not be set any colder than the hightemperature alarm set point. (See Section 1 - “Setting the HighTemperature Alarm). If the back-up system is installed with CO2, then-65°C is the coldest BUS set point that can be used (if the cabinet set pointis -75°C or colder). s
Configure Optional BUS(Back-Up System)
Set Optional BUS SetPoint
Model 900 Series 5-7Thermo Scientific
Section 5Factory Installed Options
After the freezer has stabilized and both batteries are fully charged, theBUS can be tested to verify proper operation.
1. Disconnect the AC power to the freezer by turning the power switchoff.
2. As the freezer warms up, verify the BUS injects at the desiredtemperature. Displayed temperature may vary by a few degrees frominject temperature due to the differences in probe locations.
Routinely check the vent stack for frost or ice build-up. The type of frostthat forms in the vent stack is generally very soft and may be easilyremoved with a bristle brush or soft cloth. If ice build-up has occurred, acomplete defrost may occasionally be required. See Section 4 for freezerdefrost instructions.
To disconnect the freezer back-up from the gas supply:
1. Close the supply valve.
2. Depress the test button on the BUS control box to remove the gasfrom the line.
3. Slowly disconnect the fitting assembly from the supply (in the eventthat any gas remains in the line).
The following section describes the set up and operation of the optionalchart recorder.
Disconnect Fitting Asm.and Transfer Hose
Clean Vent Stack
Figure 5-7. Recorder Details
Chart Recorder
Test BUS Operation
1. Open the plastic door of the recorder and press button #3 until thepen begins to move outward.
2. Unscrew the knob at the center of the chart and remove the paper.
3. Install the new chart paper, position the paper to the correct time lineand replace the knob.
4. Remove the cap from the felt pen and press button #3.
The chart recorder contains eight factoryprogrammed temperature ranges. To change therecorder range:
1. Press and hold button #3 for one second,then let the pen move off the chart paper.
2. Press and hold for five seconds either button#1 or button #2.
3. Release button and the green LED begins toflash. Count the number of flashes todetermine the present program setting.
4. To change the program setting, press the left or right arrows to increaseor decrease the count.
5. When the desired program number is flashing, press button #3 tobring the pen arm back onto the chart. Recording will begin in thenew program.
Note The recorder must be in service for 24 hours before performing thefollowing calibration procedure. s
1. Place an accurate thermometer in the chamber next to the recorderprobe. Temperature probes for the recorder are located in the left frontcorner of the freezer chamber (Figure 1-4).
2. After about three minutes, compare the thermometer reading with thechart recorder reading.
3. If an adjustment is necessary, press the #1 button to move the pen tothe left or the #2 to move the pen to the right. The button must beheld about five seconds before the pen begins to move. Release thebutton when the pen position matches the thermometer.
Note The felt-tip pen on the recorder requires periodic replacement. Theink will appear to fade before replacement becomes necessary. Additionalpen tips may be purchased from Thermo. s
5-8 Model 900 Series Thermo Scientific
Section 5Factory Installed Options
Installing the Chart Paper
Change RecorderTemperature Range
Program From To
1 -40 30°C
2 0 60°C
3 -100 38°C
4 -5 50°C
5 0 100°C
6 -100 200°C
7 -115 50°C
8 -10 70°C
Recorder Calibration
Model 900 Series 5-9Thermo Scientific
Section 5Factory Installed Options
The water-cooled condenser is a factory installed option (195964 [13 cuft], 195965 [17, 23, 28 cu ft], 195967 [12, 17, 20 cu ft chest]) andrequires a qualified technician at freezer installation. Installation shouldinclude proper adjustment of the regulating valve, which controls thedischarge pressure. Refer to Table 5-1 for the specifications for this option.
The five inner door option (P/N 189405 [13 cu ft], 189406 [17 cu ft],189407 [23 cu ft], 195652 [28 cu ft]) is factory installed. The freezer isconverted to accommodate four adjustable specimen shelves with the fifth“shelf” as the bottom of the freezer chamber.
Water Source Tower City
Water Pressure Not to exceed 150 psig
Water Temperature Range Not to exceed 29.4C (85F)
Inlet Connection 0.5” compression
Outlet Connection 0.5” compression
Flow Rate Required 3.0 gallons (11.4 liters) per minute 1.0 gallon (3.8 liters) per minute
Drain Required No (return line is required) Yes
Table 5-1. Water-Cooled Condenser Specifications
Water-cooledCondenser
Five Inner DoorOption
Section 6 Specifications
Model 900 Series 6-1Thermo Scientific
Model 902 903 909
Temperature Range -50°C (-58°F) to -86°C (-123°F) in an 18C to 32C * (64.4F to 89.6F) ambient
Exterior Dimensions33.3”W x 77.9” H x 32.9” F-B(84.6cm x 197.9cm x 84.6cm)
Interior Dimensions23.0”W x 51.5”H x 19.3” F-B(58.4cm x 130.8cm x 49.0cm)
Capacity 13.0 cu. ft. (368.1 liters)
Refrigeration Two 1 HP (2545 BTUH each)
Insulation Non CFC, foamed-in-place urethane: 5.0" (12.7cm) cabinet; 4.5” (11.4 cm) door
Electrical - nominalvoltage ±10%
230VAC, 50 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
120VAC, 60 Hz, 16.0 FLAOperating Range: 108VAC-130VAC
230VAC, 60 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
Breaker Requirements15 Amp, Dedicated Circuit, 15 Amp Time Delay Breaker
20 Amp, Dedicated Circuit,20 Amp Time Delay Breaker
15 Amp, Dedicated Circuit, 15 Amp Time Delay Breaker
Shipping Weight 696 lbs. ( 316 kg)
Model 904 905 910
Temperature Range -50°C(-58°F) to -86°C(-123°F) in an 18C to 32C * (64.4F to 89.6F) ambient
Exterior Dimensions33.3”W x 77.9” H x 38.9” F-B(84.6cm x 197.9cm x 94.0cm)
Interior Dimensions23.0”W x 51.5”H x 25.3” F-B(58.4cm x 130.8cm x 64.3cm)
Capacity 17.3 cu. ft. (489.9 liters)
Refrigeration Two 1 HP (2545 BTUH each)
Insulation Non CFC, foamed-in-place urethane: 5.0" (12.7cm) cabinet; 4.5” (11.4 cm) door
Electrical- nominalvoltage ±10%
120VAC, 60 Hz, 16.0 FLAOperating Range: 108VAC-130VAC
230VAC, 50 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
230VAC, 60 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
Breaker Requirements20 Amp, Dedicated Circuit, 20 Amp Time Delay Breaker
15 Amp, Dedicated Circuit,15 Amp Time Delay Breaker
15 Amp, Dedicated Circuit,15 Amp Time Delay Breaker
Shipping Weight 763 lbs. ( 346 kg)
Single Door Units
6-2 Model 900 Series Thermo Scientific
Section 6Specifications
Model 906 956 957
Temperature Range -50°C (-58°F) to -86°C (-123°F) in an 18C to 32C * (64.4F to 89.6F) ambient
Exterior Dimensions40.8”W x 77.9” H x 38.9” F-B(103.6cm x 197.9cm x 94.0cm)
Interior Dimensions30.6”W x 51.5”H x 25.3” F-B(77.7cm x 130.8cm x 64.3cm)
Capacity 23.0 cu. ft. (651.3 liters)
Refrigeration Two 1 HP (2545 BTUH each)
Insulation Non CFC, foamed-in-place urethane: 5.0" (12.7cm) cabinet; 4.5” (11.4 cm) door
Electrical- nominalvoltage ±10%
230VAC, 50 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
120VAC, 60 Hz, 16.0 FLAOperating Range: 108VAC-130VAC
230VAC, 60 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
Breaker Requirements15 Amp, Dedicated Circuit, 15 Amp Time Delay Breaker
20 Amp, Dedicated Circuit,20 Amp Time Delay Breaker
15 Amp, Dedicated Circuit, 15 Amp Time Delay Breaker
Shipping Weight 900 lbs. (408 kg)
Model 907 908
Temperature Range -50°C (-58°F) to -86°C (-123°F) in an 18C to 32C * (64.4F to 89.6F) ambient
Exterior Dimensions46.8”W x 77.9” H x 38.9” F-B(118.9cm x 197.9cm x 94.0cm)
Interior Dimensions36.6”W x 51.5”H x 27.0” F-B(93.0cm x 130.8cm x 68.6cm)
Capacity 28.0 cu. ft. (792,8 liters)
Refrigeration Two 1 HP (2545 BTUH each)
Insulation Non CFC, foamed-in-place urethane: 5.0" (12.7cm) cabinet; 4.5” (11.4 cm)door
Electrical- nominalvoltage ±10%
230VAC, 50 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
230VAC, 60 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
Breaker Requirements15 Amp, Dedicated Circuit, 15 Amp Time Delay Breaker
15 Amp, Dedicated Circuit, 15 Amp Time Delay Breaker
Shipping Weight 1070 lbs. (485 kg)
Model 900 Series 6-3Thermo Scientific
Section 6Specifications
Double Door Units
Model 991 992 986
Temperature Range -50°C (-58°F) to -86°C (-123°F) in an 18C to 32C * (64.4F to 89.6F) ambient
Exterior Dimensions33.3”W x 77.9” H x 32.9” F-B(84.6cm x 197.9cm x 83.6cm)
Interior Dimensions23.0”W x 51.5”H x 19.3” F-B(58.4cm x 130.8cm x 49.0cm)
Capacity 13.0 cu. ft. (368.1 liters)
Refrigeration Two 1 HP (2545 BTUH each)
Insulation Non CFC, foamed-in-place urethane: 5.0" (12.7cm) cabinet; 4.5” (11.4 cm) door
Electrical- nominalvoltage ±10%
230VAC, 50 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
120VAC, 60 Hz, 16.0 FLAOperating Range: 108VAC-130VAC
230VAC, 60 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
Breaker Requirements15 Amp, Dedicated Circuit, 15 Amp Time Delay Breaker
20 Amp, Dedicated Circuit,20 Amp Time Delay Breaker
15 Amp, Dedicated Circuit, 15 Amp Time Delay Breaker
Shipping Weight 696 lbs. (316 kg)
Model 993 994 988
Temperature Range -50°C (-58°F) to -86°C (-123°F) in an 18C to 32C * (64.4F to 89.6F) ambient
Exterior Dimensions33.3”W x 77.9” H x 38.9” F-B(84.6cm x 197.9cm x 94.0cm)
Interior Dimensions23.0”W x 51.5”H x 25.3” F-B(84.6cm x 130.8cm x 64.3cm)
Capacity 17.3 cu. ft. (489.9 liters)
Refrigeration Two 1 HP (2545 BTUH each)
Insulation Non CFC, foamed-in-place urethane: 5.0" (12.7cm) cabinet; 4.5” (11.4 cm) door
Electrical- nominalvoltage ±10%
120VAC, 60 Hz, 16.0 FLAOperating Range: 108VAC-130VAC
230VAC, 50 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
230VAC, 60 Hz, 12.0 FLAOperating Range: 208VAC-240VAC
Breaker Requirements20 Amp, Dedicated Circuit, 20 Amp Time Delay Breaker
15 Amp, Dedicated Circuit,15 Amp Time Delay Breaker
15 Amp, Dedicated Circuit, 15 Amp Time Delay Breaker
Shipping Weight 763 lbs. (346 kg)
6-4 Model 900 Series Thermo Scientific
Section 6Specifications
Model 990 995 989
Temperature Range -50°C(-58°F) to -86°C(-123°F) in an 18C to 32C * (64.4F to 89.6F) ambient
Exterior Dimensions 40.8”W x 77.9” H x 38.9” F-B (103.6cm x 197.9cm x 94.0cm)
Interior Dimensions 30.6”W x 51.5”H x 25.3” F-B (77.7cm x 130.8cm x 64.3cm)
Capacity 23.0 cu. ft. (651.3 liters)
Refrigeration Two 1 HP (2545 BTUH each)
Insulation Non CFC, foamed-in-place urethane: 5.0" (12.7cm) cabinet; 4.5” (11.4 cm) door
Electrical- nominalvoltage ±10%
120VAC, 60 Hz, 16.0 FLAOperating Range: 108VAC-130VAC
230VAC, 50 Hz, 12.0 FLAOperating Range: 208VAC-230VAC
230VAC, 60 Hz, 12.0 FLAOperating Range: 208VAC-230VAC
Breaker Requirements20 Amp, Dedicated Circuit, 20 Amp Time Delay Breaker
15 Amp, Dedicated Circuit,15 Amp Time Delay Breaker
15 Amp, Dedicated Circuit,15 Amp Time Delay Breaker
Shipping Weight 900 lbs. (408 kg)
CertificationsDeclaration of Conformity is available from the factory
Safety SpecificationsIndoor Use OnlyAltitude - up to 2,000 metersTemperature - 5°C to 43°CHumidity - Maximum RH 80% for temperatures up to 31°C, decreasing linearly to 50% RH at 40°CMains Supply Fluctuations - Mains supply voltage fluctuations not to exceed ±10% of the nominal voltageInstallation Category II 1 Pollution Degree 2 2
Class of Equipment I
Intended UseThis product is intended for use as a General Purpose Laboratory Freezer for storing samples or inventorybetween -40 and -86C.This unit is not intended for use in an explosive environment, nor to be used for the storage of flammableinventory. This unit is not intended for use in a Class II medical application as defined by Title 21 of theFederal Code of Regulations.______________________________________________________________________
1 Installation category (overvoltage category) defines the level of transient overvoltage which the instrument is designed to
withstand safely. It depends on the nature of the electricity supply and its overvoltage protection means. For example, in CAT II
which is the category used for instruments in installations supplied from a supply comparable to public mains such as hospital
and research laboratories and most industrial laboratories, the expected transient overvoltage is 2500V for a 230V supply and
1500V for a 120V supply.
2 Pollution degree describes the amount of conductive pollution present in the operating environment. Pollution degree 2
assumes that normally only non-conductive pollution such as dust occurs with the exception of occasional conductivity caused
by condensation.
Model 900 Series 7-1Thermo Scientific
Section 7Parts
Exploded DrawingUpright Freezer Assy
902-200-1-D Rev. 0Page 1 of 2
7-2 Model 900 Series Thermo Scientific
Section 7Parts
Exploded DrawingUpright Freezer Assy
902-200-1-D Rev. 0Page 2 of 2
Model 900 Series 7-3Thermo Scientific
Section 7Parts
Exploded DrawingDouble Door
Upright Freezers
991-200-2-D Rev. 0Page 1 of 2
7-4 Model 900 Series Thermo Scientific
Section 7Parts
Exploded DrawingDouble Door
Upright Freezers
991-200-2-D Rev. 0Page 2 of 2
Model 900 Series 7-5Thermo Scientific
Section 7Parts
Exploded DrawingSingle Door AssyUpright Freezer
902-201-1-B Rev. 5Page 1 of 2
7-6 Model 900 Series Thermo Scientific
Section 7Parts
Exploded DrawingSingle Door AssyUpright Freezer
902-201-1-B Rev. 5Page 2 of 2
Model 900 Series 7-7Thermo Scientific
Section 7Parts
Exploded DrawingDouble Door AssyUpright Freezer
902-202-1-0-B Rev. 6Page 1 of 2
7-8 Model 900 Series Thermo Scientific
Section 7Parts
Exploded DrawingDouble Door AssyUpright Freezer
902-202-1-0-B Rev. 6Page 2 of 2
Model 900 Series 7-9Thermo Scientific
Section 7Parts
Exp
lod
ed
Dra
win
gB
ase
Asse
mb
lyU
prig
ht
Fre
eze
r
90
2-2
03
-1-B
Re
v. 0
Pa
ge
1 o
f 2
7-10 Model 900 Series Thermo Scientific
Section 7Parts
Explo
ded D
raw
ing
Base
Assem
bly
Upright F
reezer
902-2
03-1
-B R
ev.
0P
age 2
of 2
Model 900 Series 7-11Thermo Scientific
Section 7Parts
Exploded Drawing230V Relay Enclosure
Upright Freezer
902-204-1-B Rev. 0Page 1 of 2
7-12 Model 900 Series Thermo Scientific
Section 7Parts
Exploded Drawing230V Relay Enclosure
Upright Freezer
902-204-1-B Rev. 0
Page of 2
Model 900 Series 7-13Thermo Scientific
Section 7Parts
Exploded Drawing120V Relay Enclosure
Freezers
902-204-2-B Rev. 0Page 1 of 2
7-14 Model 900 Series Thermo Scientific
Section 7Parts
Exploded Drawing120V Relay Enclosure
Freezers
902-204-2-B Rev. 0Page 2 of 2
Model 900 Series 8-1Thermo Scientific
Section 8Refrigeration Schematics
8-2 Model 900 Series Thermo Scientific
Section 8Refrigeration Schematics
Model 900 Series 8-3Thermo Scientific
Section 8Refrigeration Schematics
8-4 Model 900 Series Thermo Scientific
Section 8Refrigeration Schematics
Model 900 Series 8-5Thermo Scientific
Section 8Refrigeration Schematics
8-6 Model 900 Series Thermo Scientific
Section 8Refrigeration Schematics
Model 900 Series 8-7Thermo Scientific
Section 8Refrigeration Schematics
8-8 Model 900 Series Thermo Scientific
Section 8Refrigeration Schematics
Model 900 Series 9-1Thermo Scientific
Section 9Electrical Schematics
Electrical Schematic230V
ULT Freezers
902-70-2-D Rev. 1Page 1 of 3
9-2 Model 900 Series Thermo Scientific
Section 9Electrical Schematics
Electrical Schematic230V
ULT Freezers
902-70-2-D Rev. 1Page 2 of 3
Model 900 Series 9-3Thermo Scientific
Section 9Electrical Schematics
Electrical Schematic230V
ULT Freezers
902-70-2-D Rev. 1Page 3 of 3
Model 900 Series 9-4Thermo Scientific
Section 9Electrical Schematics
Electrical Schematic120V
ULT Freezers
903-70-2-D Rev. 1Page 1 of 3
9-5 Model 900 Series Thermo Scientific
Section 9Electrical Schematics
Electrical Schematic120V
ULT Freezers
903-70-2-D Rev. 1Page 2 of 3
Model 900 Series 9-6Thermo Scientific
Section 9Electrical Schematics
Electrical Schematic120V
ULT Freezers
903-70-2-D Rev. 1Page 3 of 3
Model 900 Series 10-1Thermo Scientific
Section 10Warranty Information
THER
MO F
ISHE
R SC
IENT
IFIC
FRE
EZER
WAR
RANT
YTh
e W
arra
nty
Per
iod
star
ts tw
o w
eeks
from
the
date
you
r equ
ipm
ent i
s sh
ippe
d fro
m o
ur fa
cilit
y. T
his
allo
ws
for s
hipp
ing
time
so th
e w
arra
nty
will
go
into
effe
ct a
t app
roxi
mat
ely
the
sam
e tim
e yo
ur e
quip
men
t is
deliv
ered
. The
war
rant
y pr
otec
tion
exte
nds
to a
ny s
ubse
quen
t ow
ner d
urin
g th
e w
arra
nty
perio
d.D
urin
g th
e fir
st tw
o ye
ars
of th
e w
arra
nty
perio
d, c
ompo
nent
par
ts p
rove
n to
be
non-
conf
orm
ing
in m
ater
ials
or w
orkm
ansh
ipw
ill b
e re
paire
d or
repl
aced
at T
herm
o's
expe
nse,
labo
r inc
lude
d. T
he U
LT F
reez
ers
incl
ude
an a
dditi
onal
two
year
war
rant
yon
the
com
pres
sors
, par
ts o
nly,
F.O
.B. f
acto
ry. I
nsta
llatio
n an
d ca
libra
tion
is n
ot c
over
ed b
y th
is w
arra
nty
agre
emen
t. Th
eTe
chni
cal S
ervi
ces
Dep
artm
ent m
ust b
e co
ntac
ted
for w
arra
nty
dete
rmin
atio
n an
d di
rect
ion
prio
r to
any
wor
k be
ing
per-
form
ed. E
xpen
dabl
e ite
ms,
i.e.
, gla
ss, f
ilter
s, p
ilot l
ight
s, li
ght b
ulbs
and
doo
r gas
kets
are
exc
lude
d fro
m th
is w
arra
nty.
In a
dditi
on to
the
stan
dard
war
rant
y, th
e fo
amed
-in-p
lace
cab
inet
des
ign
carr
ies
a un
it pr
oduc
tion
lifet
ime
war
rant
y (fo
amed
-in
-pla
ce c
abin
et, e
vapo
rato
r and
foam
ed-in
-pla
ce d
oor;
parts
onl
y). P
leas
e co
ntac
t you
r sal
es re
pres
enta
tive
or T
herm
o fo
rad
ditio
nal i
nfor
mat
ion.
Rep
lace
men
t or r
epai
r of c
ompo
nent
par
ts o
r equ
ipm
ent u
nder
this
war
rant
y sh
all n
ot e
xten
d th
e w
arra
nty
to e
ither
the
equi
pmen
t or t
o th
e co
mpo
nent
par
t bey
ond
the
orig
inal
two
year
war
rant
y pe
riod.
The
Tec
hnic
al S
ervi
ces
Dep
artm
ent m
ust
give
prio
r app
rova
l for
the
retu
rn o
f any
com
pone
nts
or e
quip
men
t.TH
IS W
AR
RA
NTY
IS E
XC
LUS
IVE
AN
D IN
LIE
U O
F A
LL O
THE
R W
AR
RA
NTI
ES
, WH
ETH
ER
WR
ITTE
N, O
RA
L, O
RIM
PLI
ED
. N
O W
AR
RA
NTI
ES
OF
ME
RC
HA
NTA
BIL
ITY
OR
FIT
NE
SS
FO
R A
PA
RTI
CU
LAR
PU
RP
OS
E S
HA
LL A
PP
LY.
Ther
mo
shal
l not
be
liabl
e fo
r any
indi
rect
or c
onse
quen
tial d
amag
es in
clud
ing,
with
out l
imita
tion,
dam
ages
rela
ting
to lo
stpr
ofits
or l
oss
of p
rodu
cts.
Your
loca
l The
rmo
Sal
es O
ffice
is re
ady
to h
elp
with
com
preh
ensi
ve s
ite p
repa
ratio
n in
form
atio
n be
fore
you
r equ
ipm
ent
arriv
es. P
rinte
d in
stru
ctio
n m
anua
ls c
aref
ully
det
ail e
quip
men
t ins
talla
tion,
ope
ratio
n, a
nd p
reve
ntiv
e m
aint
enan
ce.
If eq
uipm
ent s
ervi
ce is
requ
ired,
ple
ase
call
your
Tec
hnic
al S
ervi
ces
Dep
artm
ent a
t 1-8
00-4
38-4
851
(US
A an
d C
anad
a) o
r1-
740-
373-
4763
. We'
re re
ady
to a
nsw
er y
our q
uest
ions
on
equi
pmen
t war
rant
y, o
pera
tion,
mai
nten
ance
, ser
vice
, and
spec
ial a
pplic
atio
ns. O
utsi
de th
e U
SA
, con
tact
you
r loc
al d
istri
buto
r for
war
rant
y in
form
atio
n.
ISO
9001
REGI
STER
EDR
ev. 0
6/1
1
10-2 Model 900 Series Thermo Scientific
Section 10Warranty Information
THER
MO FI
SHER
SCIEN
TIFIC
FREE
ZER
INTER
NATIO
NAL D
EALE
R WA
RRAN
TYTh
e W
arra
nty
Per
iod
star
ts tw
o m
onth
s fro
m th
e da
te y
our e
quip
men
t is
ship
ped
from
our
faci
lity.
Thi
s al
low
s fo
r shi
ppin
g tim
eso
the
war
rant
y w
ill g
o in
to e
ffect
at a
ppro
xim
atel
y th
e sa
me
time
your
equ
ipm
ent i
s de
liver
ed. T
he w
arra
nty
prot
ectio
nex
tend
s to
any
sub
sequ
ent o
wne
r dur
ing
the
war
rant
y pe
riod.
Dea
lers
who
sto
ck o
ur e
quip
men
t are
allo
wed
an
addi
tiona
l fou
rm
onth
s fo
r del
iver
y an
d in
stal
latio
n, p
rovi
ding
the
war
rant
y ca
rd is
com
plet
ed a
nd re
turn
ed to
the
Tech
nica
l Ser
vice
sD
epar
tmen
t.D
urin
g th
e fir
st tw
o ye
ars
of th
e w
arra
nty
perio
d, c
ompo
nent
par
ts p
rove
n to
be
non-
conf
orm
ing
in m
ater
ials
or w
orkm
ansh
ipw
ill b
e re
paire
d or
repl
aced
at T
herm
o's
expe
nse,
labo
r exc
lude
d. T
he U
LT F
reez
ers
incl
ude
an a
dditi
onal
two
year
war
rant
yon
the
com
pres
sors
, par
ts o
nly,
F.O
.B. f
acto
ry.
Inst
alla
tion
and
calib
ratio
n is
not
cov
ered
by
this
war
rant
y ag
reem
ent.
The
Tech
nica
l Ser
vice
s D
epar
tmen
t mus
t be
cont
acte
d fo
r war
rant
y de
term
inat
ion
and
dire
ctio
n pr
ior t
o an
y w
ork
bein
g pe
rform
ed.
Exp
enda
ble
item
s, i.
e., g
lass
, filt
ers,
pilo
t lig
hts,
ligh
t bul
bs a
nd d
oor g
aske
ts a
re e
xclu
ded
from
this
war
rant
y.In
add
ition
to th
e st
anda
rd w
arra
nty,
the
foam
ed-in
-pla
ce c
abin
et d
esig
n ca
rrie
s a
unit
prod
uctio
n lif
etim
e w
arra
nty
(foam
ed-in
-pl
ace
cabi
net,
evap
orat
or a
nd fo
amed
-in-p
lace
doo
r; pa
rts o
nly)
. Ple
ase
cont
act y
our s
ales
repr
esen
tativ
e or
The
rmo
for a
ddi-
tiona
l inf
orm
atio
n.R
epla
cem
ent o
r rep
air o
f com
pone
nt p
arts
or e
quip
men
t und
er th
is w
arra
nty
shal
l not
ext
end
the
war
rant
y to
eith
er th
e eq
uip-
men
t or t
o th
e co
mpo
nent
par
t bey
ond
the
orig
inal
two
year
war
rant
y pe
riod.
The
Tec
hnic
al S
ervi
ces
Dep
artm
ent m
ust g
ive
prio
r app
rova
l for
the
retu
rn o
f any
com
pone
nts
or e
quip
men
t.TH
IS W
AR
RA
NTY
IS E
XC
LUS
IVE
AN
D IN
LIE
U O
F A
LL O
THE
R W
AR
RA
NTI
ES
, WH
ETH
ER
WR
ITTE
N, O
RA
L, O
RIM
PLI
ED
. NO
WA
RR
AN
TIE
S O
F M
ER
CH
AN
TAB
ILIT
Y O
R F
ITN
ES
S F
OR
A P
AR
TIC
ULA
R P
UR
PO
SE
SH
ALL
AP
PLY
.Th
erm
o sh
all n
ot b
e lia
ble
for a
ny in
dire
ct o
r con
sequ
entia
l dam
ages
incl
udin
g, w
ithou
t lim
itatio
n, d
amag
es re
latin
g to
lost
prof
its o
r los
s of
pro
duct
s.Yo
ur lo
cal T
herm
o S
ales
Offi
ce is
read
y to
hel
p w
ith c
ompr
ehen
sive
site
pre
para
tion
info
rmat
ion
befo
re y
our e
quip
men
tar
rives
. Prin
ted
inst
ruct
ion
man
uals
car
eful
ly d
etai
l equ
ipm
ent i
nsta
llatio
n, o
pera
tion,
and
pre
vent
ive
mai
nten
ance
.If
equi
pmen
t ser
vice
is re
quire
d, p
leas
e co
ntac
t you
r loc
al d
istri
buto
r or T
herm
o (1
-800
-438
-485
1 in
US
A an
d C
anad
a, o
r1-
740-
373-
4763
). W
e're
read
y to
ans
wer
you
r que
stio
ns o
n eq
uipm
ent w
arra
nty,
ope
ratio
n, m
aint
enan
ce, s
ervi
ce, a
nd s
peci
alap
plic
atio
ns. O
utsi
de th
e U
SA
, con
tact
you
r loc
al d
istri
buto
r for
war
rant
y in
form
atio
n.
ISO
9001
REGI
STER
EDR
ev. 0
6/1
1
Model 900 Series A -1Thermo Scientific
Appendix A Handling Liquid Nitrogen
Warning Contact of liquid nitrogen or cold gas with the skin or eyes maycause serious freezing (frostbite) injury. s
Handle liquid nitrogen carefully.
The extremely low temperature can freeze human flesh very rapidly.When spilled on a surface the liquid tends to cover it completely andintimately, cooling a large area. The gas issuing from the liquid is alsoextremely cold. Delicate tissue, such as that of the eyes, can be damagedby an exposure to the cold gas which would be too brief to affect the skinof the hands or face.
Never allow any unprotected part of your body to touch objects cooledby liquid nitrogen.
Such objects may stick fast to the skin and tear the flesh when you attemptto free yourself. Use tongs to withdraw objects immersed in the liquid,and handle the object carefully.
Wear protective clothing.
Protect your eyes with a face shield or safety goggles (safety glasses withoutside shields do not give adequate protection). Always wear gloves whenhandling anything that is, or may have been, in immediate contact withliquid nitrogen. Insulated gloves are recommended, but heavy leathergloves may also be used. The gloves should fit loosely, so that they can bethrown off quickly if liquid should splash into them. When handlingliquid in open containers, it is advisable to wear high-top shoes. Trousers(which should be cuffless if possible) should be worn outside the shoes.
A -2 Model 900 Series Thermo Scientific
Appendix AHandling Liquid Nitrogen
The safe handling and use of liquid nitrogen in cryogenic refrigerators anddewar flasks is largely a matter of knowing the potential hazards and usingcommon-sense procedures based on that knowledge. There are twoimportant properties of liquid nitrogen that present potential hazards:
1. It is extremely cold. At atmospheric pressure, liquid nitrogen boils at -320°F (-196°C).
2. Very small amounts of liquid vaporize into large amounts of gas. Oneliter of liquid nitrogen becomes 24.6 cu. ft. (700l) of gas.
The safety precautions in this booklet must be followed to avoid potentialinjury or damage which could result from these two characteristics. Do notattempt to handle liquid nitrogen until you read and fully understand thepotential hazards, their consequences, and the related safety precautions.Keep this booklet handy for ready reference and review.
Note Because argon is an inert gas whose physical properties are very similarto those of nitrogen, the precautions and safe practices for the handling anduse of liquid argon are the same as those for liquid nitrogen. s
Use only containers designed for low temperature liquids.
Cryogenic containers are specifically designed and made of materials that canwithstand the rapid changes and extreme temperature differencesencountered in working with liquid nitrogen. Even these special containersshould be filled SLOWLY to minimize the internal stresses that occur whenany material is cooled. Excessive internal stresses can damage the container.
Do not cover or plug the entrance opening of any liquid nitrogenrefrigerator or dewar. Do not use any stopper or other device that wouldinterfere with venting of gas.
These cryogenic liquid containers are generally designed to operate with littleor no internal pressure. Inadequate venting can result in excessive gaspressure which could damage or burst the container. Use only the loose-fitting necktube core supplied or one of the approved accessories for closingthe necktube. Check the unit periodically to be sure that venting is notrestricted by accumulated ice or frost.
Introduction
Use proper transfer equipment.
Use a phase separator or special filling funnel to prevent splashing andspilling when transferring liquid nitrogen into or from a dewar orrefrigerator. The top of the funnel should be partly covered to reducesplashing. Use only small, easily-handled dewars for pouring liquid. Forthe larger, heavier containers, use a cryogenic liquid withdrawal device totransfer liquid from one container to another. Be sure to followinstructions supplied with the withdrawal device. When liquid cylindersor other large storage containers are used for filling, follow the instructionssupplied with those units and their accessories.
Do not overfill containers.
Filling above the bottom of the necktube (or specified maximum level) canresult in overflow and spillage of liquid when the necktube core or cover isplaced in the opening.
Never use hollow rods or tubes as dipsticks.
When a warm tube is inserted into liquid nitrogen, liquid will spout fromthe top of the tube due to gasification and rapid expansion of liquid insidethe tube.
Warning Nitrogen Gas Can Cause Suffocation Without Warning! s
Store and use liquid nitrogen only in a well-ventilated place.
As the liquid evaporates, the resulting gas tends to displace the normal airfrom the area. In closed areas, excessive amounts of nitrogen gas reducethe concentration of oxygen and can result in asphyxiation. Becausenitrogen gas is colorless, odorless and tasteless, it cannot be detected by thehuman senses and will be breathed as if it were air. Breathing anatmosphere that contains less than 18% oxygen can cause dizziness andquickly result in unconsciousness and death.
Note The cloudy vapor that appears when liquid nitrogen is exposed tothe air is condensed moisture; not the gas itself. The issuing gas isinvisible. s
Never dispose of liquid nitrogen in confined areas or places where othersmay enter.
Disposal of liquid nitrogen should be done outdoors in a safe place. Pourthe liquid slowly on gravel or bare earth where it can evaporate withoutcausing damage. Do not pour the liquid on pavement.
Model 900 Series A -3Thermo Scientific
Appendix AHandling Liquid Nitrogen
A -4 Model 900 Series Thermo Scientific
Appendix B Handling Liquid CO2
Warning High concentrations of CO2 gas can cause asphyxiation! OSHAStandards specify that employee exposure to carbon dioxide in any eight-hour shift of a 40-hour work week shall not exceed the eight-hour timeweighted average of 5000 PPM (0.5% CO2). The short term exposurelimit for 15 minutes or less is 30,000 PPM (3% CO2). Carbon dioxidemonitors are recommended for confined areas where concentrations ofcarbon dioxide gas can accumulate. s
Store and use liquid CO2 only in a well-ventilated place.
As the liquid evaporates, the resulting gas tends to displace the normal airfrom the area. In closed areas, excessive amounts of CO2 gas reduce theconcentration of oxygen and can result in asphyxiation. Because CO2 gasis colorless, odorless and tasteless, it cannot be detected by the humansenses and will be breathed as if it were air. Breathing an atmosphere thatcontains less than 18% oxygen can cause dizziness and quickly result inunconsciousness and death.
Note The cloudy vapor that appears when liquid CO2 is exposed to the airis condensed moisture; not the gas itself. The issuing gas is invisible. s
Never dispose of liquid CO2 in confined areas or places where othersmay enter.
Disposal of liquid CO2 should be done outdoors in a safe place. Pour theliquid slowly on gravel or bare earth where it can evaporate withoutcausing damage. Do not pour the liquid on pavement.
Model 900 Series A -5Thermo Scientific
Appendix C First Aid
If a person seems to become dizzy or loses consciousness while workingwith liquid nitrogen or carbon dioxide, move to a well-ventilated areaimmediately. If breathing has stopped, apply artificial respiration. Ifbreathing is difficult, give oxygen. Call a physician. Keep warm and atrest.
If exposed to liquid or cold gas, restore tissue to normal body temperature(98.6° F) as rapidly as possible, followed by protection of the injured tissuefrom further damage and infection. Remove or loosen clothing that mayconstrict blood circulation to the frozen area. Call a physician. Rapidwarming of the affected part is best achieved by using water at 108° F.Under no circumstance should the water be over 112° F, nor should thefrozen part be rubbed either before or after rewarming. The patientshould neither smoke nor drink alcohol.
A -6 Model 900 Series Thermo Scientific
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